ABSTRACT
Contents 14.1 Interfaces Host New Multiferroics ...........................................................380 14.2 Ionic Defects-An Additional Degree of Freedom ............................... 381 14.3 Topological Defects (Domain Walls, Vortices, Skyrmion) .................. 381 14.4 Multiferroics Go Hybrid and 2D .............................................................. 382 References ............................................................................................................... 383
of multiferroics. For example, although type-II multiferroics usually show strong magnetoelectric coupling, their ferroic-ordering temperatures are way below the room temperature, and thus are not viable for practical applications. Type-I multiferroics, such as BiFeO3, may possess both electric and magnetic long-range orders above the room temperature. Unfortunately, most of them are antiferromagnets, which exhibit no macroscopic magnetization. erefore, heterostructures with a ferromagnetic layer have to be fabricated to indirectly control the ferromagnetism using an electric eld [5,6]. However, the degree of control is not reliable due to the fragile interfacial exchange coupling [7]. It is fair to say that the main obstacle for this eld is the lack of a true room-temperature multiferroic material with robust ferroelectric and ferromagnetic orders.
